NLMS (normalized least mean square) algorithm is widely used in echo canceller. However, due to high correlation of speech signals, the performance of echo canceller based on NLMS is depressed.
Next, it finds out the spectra and cross-spectra of residual process by using least-square forecast procedure, through the correlation function of residual process.
再用最小二乘预测方法，通过剩余过程的相关函数，找到剩余过程的自谱及互谱。
3
In order to obtain reliable strain field, full-field strain measurement based on least-square fitting of local displacement for digital image correlation method is proposed.